Many newcomers think that they can easily scam in this forum by offering such services. They may be successful in other forms but it is almost impossible to scam in bitcointalk as there are many eyes who are seeing and will warn you if they notice anything suspicious.
Those who tries to scam by posting this type of service, asking for loan or trading anything which can be used for scam are not newcomers. They just open new account to provide a service and few time they might be successful to make a scam from those who are not aware about the scam activity. Also, those who are scammer not only trying in this forum but also trying many platform.
Newbie account is easy to dump that's why many experience scammers used this to attempt scamming newbie investors and try to make them believe that they can earn profits by handing some bucks to them. Gladly we are here and many experience users can debunk the real intention on this kind of post and people need to be more aware that there are many like this exist here trying to offer good profits but in the end they will just scam people who believe on what they say.
Fortunately for newbies in this forum there are a lot of smart people which have seen all kind of scam attempts in the past and they can recognize them immediately and warn everyone about it, however it is obvious scammers are not going to concentrate exclusively on this platform when trying to run their scams.
Most likely they post something similar to this in other forums and social media, and as long as someone is naive enough to believe them then they may make some money with those scams, after all if they were not successful once in a while I doubt they will bother to keep doing something that does not gives them any profits.